33 lines
928 B
Python
33 lines
928 B
Python
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from pyparsing import infixNotation, opAssoc, Keyword, Word, alphas, ParserElement
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# 启用忽略大小写的关键字
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ParserElement.enablePackrat()
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# 定义基础元素
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variable = Word(alphas)
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predicate = variable + '(' + variable + ',' + variable + ')'
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# 定义逻辑运算符
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and_ = Keyword("And")
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or_ = Keyword("Or")
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not_ = Keyword("Not")
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# 由于你的表达式使用 "&" 和 "|"
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and_sym = Word("&", exact=1)
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or_sym = Word("|", exact=1)
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# 定义逻辑表达式的语法
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expr = infixNotation(predicate,
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[
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(not_, 1, opAssoc.RIGHT),
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(and_sym, 2, opAssoc.LEFT, and_),
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(or_sym, 2, opAssoc.LEFT, or_),
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])
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# 解析示例表达式
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goal = "Not(On(Yogurt,Table1)) & (On(Coffee,Table1) | On(ADMilk,Table1)) & At(Robot,Bar)"
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parsed_expr = expr.parseString(goal)
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# 打印解析结果
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print(parsed_expr.asList())
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